send along full reproducing test cases and that will reveal all. On May 19, 2009, at 11:36 AM, Tiago Becker wrote:
> "this indicates a None is being sent as a column somewhere." > > I'm just not passing the order_by clause... > > "I dont see the SQLAlchemy expression you're dealing with here. the > symptom you describe is when placing a FROM object in the columns > clause of a SELECT, the object is also added to the FROM clause > automatically, unless additional steps are taken to prevent this. A > CASE statement is not is not a FROM object, its a column object, so > this should not occur. If you are placing a SELECT in the columns > clause of another SELECT, call as_scalar() on it." > > hmm, something strange here, as i'm not passing a from object in the > columns... > > im doing this: > > self.fields = ' case field1 > when 34 then field2 > when 94 then field3 > when 48 then field4 > end another_field' > > self.from = ' table ' > > self.where = ' 1 = ' //nevermind this > > then: > > sql = select(columns=[self.fields], from_obj=self.tables, > whereclause=self.where, bind=self.engine, order_by= ' 1 ') > > results in > > select > case field1 > when 34 then field2 // this is the problem... in the > inner select (the FROM select), field2 is not selected, so it does > not exists > when 94 then field3 > when 48 then field4 > end another_field > from > (select > case field1 > when 34 then field2 > when 94 then field3 > when 48 then field4 > end another_field > from > table > where > 1 = 1) > > this is can be fixed by replacing the fields in the outer join by > adding *, as it will select all the fields in the query... > > How do i solve this? > > On Tue, May 19, 2009 at 12:13 PM, Michael Bayer <mike...@zzzcomputing.com > > wrote: > > > On May 19, 2009, at 10:39 AM, Tiago Becker wrote: > > > Hi. > > > > Im still trying to use the select object from sqlalchemy, but i > > found a strange (bug or not) behavior: > > > > sql = select(columns=[self.fields], from_obj=self.tables, > > whereclause=self.where, bind=self.req.cfg.engine, order_by= ' 1 ') > > > > 1) without order by, i get an error: AttributeError: 'NoneType' > > object has no attribute 'proxies'. is this intended? > > this indicates a None is being sent as a column somewhere. > > > 2) the select fails when theres a CASE instruction, like this: > > > > case field1 > > when 34 then field2 > > when 94 then field3 > > when 48 then field4 > > end another_field > > > > It fails because sqlalchemy does a subquery, but instead of using * > > (in the outer query, to bring all the fields) it just paste the same > > fields from the original query, failing to get all the fields in the > > case expression.... > > I dont see the SQLAlchemy expression you're dealing with here. the > symptom you describe is when placing a FROM object in the columns > clause of a SELECT, the object is also added to the FROM clause > automatically, unless additional steps are taken to prevent this. A > CASE statement is not is not a FROM object, its a column object, so > this should not occur. If you are placing a SELECT in the columns > clause of another SELECT, call as_scalar() on it. > > > > > > --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to sqlalchemy+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~----------~----~----~----~------~----~------~--~---
